<template>
  <div class="app-container">
      <!-- 检索输入项 -->
    <el-input v-model="filterText" placeholder="Filter keyword" style="margin-bottom:30px;" />

    <el-tree
      ref="tree2"
      :data="data2"
      :props="defaultProps"
      :filter-node-method="filterNode"
      class="filter-tree"
      default-expand-all
    />

  </div>
</template>

<script>
    import subjectApi from '@/api/edu/subject'

    export default {
        data() {
            return {
                filterText: '',
                data2: [],    //返回所有分离的数据
                defaultProps: {
                    children: 'children',
                    label: 'title'
                }
            }
        },

        created() {
            this.getAllSubjectList()
        },

        watch: {
            filterText(val) {
            this.$refs.tree2.filter(val)
            }
        },

        methods: {
            getAllSubjectList() {
                subjectApi.getSubjectList()
                    .then(response => {
                        this.data2 = response.data.list
                    })
            },

            filterNode(value, data) {
                if (!value) return true
                return data.title.toLowerCase().indexOf(value.toLowerCase()) !== -1
            }
        }
    }
</script>